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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a771f7c167e8ab66973b70045f5b727eea7a3546d8e2b5aebfc7e13de32f3237' 
  AND token = '21hMp5+qYtpa2i78CasDFztd8+P4sz4+7Map6r1MYMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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