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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ef4415195ae1d7b9e557e41d75f3a60c6abe763635e0d75e5991764fabcc50' 
  AND token = 'Jy1Ltp5ot3pu9JArwlMzdf/wWbZRJrspyIKXcRwK+Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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