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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362246b6d50fff1e92302b79ad413e402540b1646dc9d053680eeb973600325d' 
  AND token = 'd6fiKN7L8KNhnjcBsqgmCHF0Fg7yyntIdKGrEbWZCWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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