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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a224d2157093823b0d16149397ae6c927ee8f3e56b140005539943cd5d0f0dc4' 
  AND token = 'UbAAMamloc/nKMTd4glbaWHV7Uq/VkG74JLdt/vqsIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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