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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4256d4e66b61b53349b717b2c7377259763f01de64fac32002c5b51a7301f0af' 
  AND token = '12moJUkW2Jn09X+ydOvcQBaV8FZCUolz7hbbEJJJ0l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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