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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8996893520dbbfdc81a1012600740b1c9069d369aa42706d6b884bc1aa6ce934' 
  AND token = 'O2Q5mfZ+9/UYJAlO/BOY09Fcn/0fwt5wG3lN0ZPsw/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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