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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94714be224cabc8df86f5d7a5093807098e68c33ee59ee7440bec927dfe74f28' 
  AND token = 'hmq8zvks+Vm2bQKLc24fhRpY69fBTbWIpbBeXDyMdRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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