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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e87cbf205735d3ae83da850372bb803d225bab513be2e0c1ff51922c2ba64e' 
  AND token = 'uutm1IjxVMMSeRp44Cl7xzu2S5PhPF/RJHikogHZ5Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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