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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e19e91a182ff42b2e436986dc7bc0b8cfdd27e6c258207279efb7bfd29921e' 
  AND token = 'vwxOTiDp+QpFSQawPaX86MV+ZBLoahw3QM/XztdcD7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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