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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf208c028561847f0cc88fceed5a6b433595a086d4ddd63d55c494b4d25c91f' 
  AND token = 'O7zmoMJeaha7J/eIWeu78gSyd6xdJ1td4PqlrsRPO+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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