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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3bae70132c0c2a6cb5bcdf878d71c34d7f32a3805cd797bfd4e8777f37d2e1' 
  AND token = 'KcPYYnFevgARLuDfihnaoUcvuA9ZWwpp5AFmJ0aw0mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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