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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0948f3371c5028f4465aa92235d2c03bc71ef10ac82c47719fdef36c631ea197' 
  AND token = 'H2IiWB1aJ1Bvun/HsccHznzZRNQv4Xydp2ATcDBwNlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}