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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8811e2ab44d5a99e447dc18cfe38635bb4212ffd41b09a7dfa0616ac2b12b46e' 
  AND token = 'XOXRk0AJTq04FzYkCnxa7UZgB7rxgJ9O2wkdowzxCPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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