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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22b8f5bb2c1d4309699ad58e70ade64e299752c23f27735a966be33402e15fc' 
  AND token = 'QMhLjMElkXf93/u2uJmYuCTDfO0v8r6luMBLTtlHeIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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