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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82812d732d5ffcf508780225f586079dbae8c51569e826e4f8bba2f0a3482f65' 
  AND token = 'ZMC/NWNdnLANPCnDkGiHhzuZ0EdbD5+T1p6iv0P1oeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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