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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bf4e518533fdbfb7f6524aa8dce6ef32ba4703d3c60f33e14f59961491aed0' 
  AND token = 'o+2/10ye/zwDS6U8zJlXAE5Ak5OiSuO3JCEIPV+6zjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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