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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ee968baebece8c55fc614d124b1a4e1d144cd32fe4b7a54dcdad1db6bc23d5' 
  AND token = 'qR50MMtw1QKX3DMpcgysQXNbDBUCaReKDFuUWZ2ozCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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