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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde32f9feb921c57a28369d2976f4a76205aca34a786cf8d470316cc90fb4d0a' 
  AND token = 'wQ85HPqaICbAuvyrb6S61UjsK1DtDSSjCoT0ZNoP4K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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