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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c319a1ecea78de322a86f9a01ad68ed7e3cac95c625872af2f39d0c8ff44fd' 
  AND token = 'GruD71o9BNpicU0ZWbxQvQNoqAadzXFgZuAu4D8ISaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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