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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a417d8a51055e74eac956e9ee450c93096995f5596b9b28f4058028bb00d7e7d' 
  AND token = 'tBs4a/an4qpfyLHU0t03nu5u8bnDsul3A70AiA/P63U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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