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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28251cdd80aeb8d6ad720f72e4b7e2f40cae1862a6a19f33cd9bbdc627e66855' 
  AND token = 'uqD05fLl/76pTY5LbojfZMyLLyXmwML8jIKid5tWgzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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