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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd136ecb6320488a0f9cff9749ad18b58219104f0dd30e197e339c3a28cc48528' 
  AND token = 'AykCUnS8dlN6IYX1wNsZa0LtjsAUAP2jltSMQ2kqurA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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