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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77ee30c28d3b6ecd659940553f60142ba749ade7e36816f7184e2c9578e77bd' 
  AND token = '0Jv2F4YUR+RDKXY/7AGOI1Zi1kkqyXLtG3NslyENTtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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