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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954ad625fccafe7865cbd4506f48af35feed6d48d262184961d1d4a651334942' 
  AND token = 'YUkHr1AMXT9q5FAKRqWlam5wElrfPMi9d1il8owmftU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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