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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3f97d5aa3db7c64754ba4dd92031559ae1cfe47404ab9090e2b256d00af132' 
  AND token = 'heVQOvCC6uTinJPDLWafc/EPJA1VjRbVjahpwedfy1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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