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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8630e1fbb740dc909a478828a0ca03f7d06167f9e4a5eb2d95b3a99cda553bd2' 
  AND token = '+2jEvc8xv95ECz7+0yJYun2pxEVT/axYBjMGF8iAoU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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