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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aac93e4e6c45dd73572a2df058296564144f9f5ddf2b9f5bab6897bd81f8e0a' 
  AND token = 'IQyGqoatFRehO6Hhrc51otbU+gPdUSvDcH8rFAyOKNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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