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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be26c787f30722a677c84f5330d6abfc8baa57fb8cc6a33c8266eab5382601a' 
  AND token = 'k7NcOsWJIIr7CRA6B4aJ+bq2tYEZkYpykVUGIFFCGFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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