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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8836f6db3ef2e6ccd6394c7f1245639c7984beca8ba3e713b6e7c44e16568c' 
  AND token = 'r8CbYWlNPtkcNi7Tm1Glxc8Sni/DiOBLLzMeNB7usZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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