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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee44fbd4a98e95eda262cdfd7e452d2baf06d3a8f2b219a579c5725afce35e68' 
  AND token = 'gZ98NHcHyoLX6TK7PM654YxJWqw+wAPGdlfPQu5j+SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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