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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319dbac80984e520b2b16a52d88afe52f166e25ed7f076257ce9c163a186bc6e' 
  AND token = 'WY6CfFBP/dAuwKgm6tcAupjDLBg6BK812zT2PtXYE4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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