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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd740e6624b0abcae8b623e68cc9e23da8ab3ed3178bc0c682f508d075d666363' 
  AND token = '+jZFCkxsdngf+SQcSW+4WIXjSVGJiL3mVxV+vJPjiVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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