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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0848f9a3a1f696f86b96ebc28f6ad27fbaf5db9e0986f7ddb7118b4db54f6b4f' 
  AND token = 'QvorxOjSeyC2taNmrjcCQvuMhc/u4P2NAQa+lUITHTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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