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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b0b45d331d4e57d1e4d9c63ae49c72d2f0cf0ed2f752171d0c6b6a5570c666' 
  AND token = 'wTPkggmKcHuMJXjEK8AKyPUGKGy46P4JPPuOL9iTC5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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