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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a93e9460e94cd030ea210a604250df4f6bae1be24f86e9b48df5d4f2d6828f20' 
  AND token = 'WsL309/hnEsBnbpPKlUJtpf2fmSj4UGSgcqFG6cuK1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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