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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08722ee7a8697a3ad24f8a86d123cdf99677fffd14d89f58fb0e5b6912b8b4e' 
  AND token = 'i+1h2QfKisPTaq4/LrJ5k6pL/Qpff0sxZsvnTbqr0tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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