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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7936e420525320bf90e568e868df300af7000c6fd2aa92b780669ae2d32543f1' 
  AND token = 'wGrDx+We9NK9F0hMfa4IaP31JZD9vo/VdHOHWwofM0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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