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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f505f53145a3337576bfe67c7971a94a771647bffeb3ba122f03a73ef0029f' 
  AND token = '/DeaCIGwmBdWqSlA3GDc3ULz3Drghh79eKCAkYSVsI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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