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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d50fc60710362a5e0602d7bc44802b15fcfbaca0e2d8d62435f6b6ef9b5b73' 
  AND token = 'AIMcaxNckYDq09lrikwmnDfvzdK8fyE8PRw/lyMwOKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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