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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd548f45403fd675869f0fea0d8baaa93bca6ed2c5d58b72162c9dee8fffb8694' 
  AND token = 'Stv29s57qyHHRPzf1o1YVsfQ5wy/SgbYDYWRsYsjwVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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