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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fb9bee3f077ddf501cf3bc4cb306d031427a4aae224c7eaed2e629fa485df9' 
  AND token = '52nlduNTvTQEge49SGQv7fxxNrnhYqbOxL3P8nIRhRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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