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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4206ebebe1b0b1181c2f8cab2422f7dd0d90b8e2c6b5129ccf90055cb22cacfd' 
  AND token = 'ecwUX1qKFnCl4Z39GQV5julrVYjYVVE4JmQ1ThMlIXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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