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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f25ef0df9072a6c3a7a7d99f3cae5a21dac81a875fe9e95f44e9fcfbaaf6f2' 
  AND token = 'BOp6GyNa3mN/In9xaRsrJmDuNud0Hbpk3wOZdBLHH7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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