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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207d7b9c558e0dd4e5878da7887f27725213471a31e80fe702e3816b68a4fe9e' 
  AND token = 'pVGNDzbe7+a0+Iucdi+cNI/IphiIBZ7/zmUiSqdeAYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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