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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290a9530e5afac6868ef1f14ac6ad38de2bc29c368344a4eec8d15342c39ed9a' 
  AND token = 'MbH8O0cJEj7f88pzXMycEs3+kTLbT/lxItE3s6FPl7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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