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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04756e84479e057cc68943ef728731b35c6b972e35e592bd0caaef03018b1fa8' 
  AND token = 'bDVKLyaGWbV+s3JUxCWOVeNi6i6jbzGqBNZ+30A58nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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