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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b229e24d69a6e36b1fbcfff20ed4a8cf44df62c7a74ea0969a86e6b89902a918' 
  AND token = 'loskryWEDaQ6i5H2HysWatYs7SZwKfp3sz3aKFwvdl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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