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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09932da5d94c4d4ac963bf87805e49ee2339cef0631221a0f7a53a0335577b6' 
  AND token = 'zf0jz13lbuJWJjMrxEshyoF1wsHqT9qhEmNQxRogJI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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