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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c69e69456cc194bdc768475371a123f595c3ab4ed054b036ba787348cf7994' 
  AND token = 'GsEcos58S79GsPPb2trQ3Dd9JjRK+88bYIWcy/Stg/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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