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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beea4bbe93a13ef4ddf50dbca7584f2120b5ae006c288a1d8903988c50951993' 
  AND token = 'PH6u2XQu8X/VD5c+e6Q7ST3VrYuRrB/Hssu3whRhSP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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